Stalling
Thread Starter
3rd Gear
Joined: Nov 2025
Posts: 3
Likes: 0
Stalling
Hey! Recently bought an 2001 vette. Latley it has been acting weird, starts fine in the mornings. And idles until you blip the throttle. Then It will drop to 400 and act like it wants to die. After a few minutes it will sporadically start surging from 400-700, and sometimes it will die.
When it dies i have to hold the throttle open a bit to keep it running, and if I let off it completely shuts off. I put a used throttle body and a maf on it as of today. I need to know all the things that can cause this so I can figure it out. It has 55psi of fuel pressure when running.
When it dies i have to hold the throttle open a bit to keep it running, and if I let off it completely shuts off. I put a used throttle body and a maf on it as of today. I need to know all the things that can cause this so I can figure it out. It has 55psi of fuel pressure when running.
Moderator, Tech Contributor
Joined: Sep 2013
Posts: 15,320
Likes: 3,927
From: Cape Coral, Florida
A “used” TB and MAF sensor can cause this…did you purchase them on EBay ??…you need to be checking live data with a scan tool to see why it’s shutting off instead of just throwing parts at it…with bad parts you may building in more problems…the MAF sensor should be no less than 5.7 grams/second at idle with the engine warmed up with no loads…MAP sensor should be reading 14.7 or 101 kPa with key on engine off if you are at sea level.
Thread Starter
3rd Gear
Joined: Nov 2025
Posts: 3
Likes: 0
A “used” TB and MAF sensor can cause this…did you purchase them on EBay ??…you need to be checking live data with a scan tool to see why it’s shutting off instead of just throwing parts at it…with bad parts you may building in more problems…the MAF sensor should be no less than 5.7 grams/second at idle with the engine warmed up with no loads…MAP sensor should be reading 14.7 or 101 kPa with key on engine off if you are at sea level.
Moderator, Tech Contributor
Joined: Sep 2013
Posts: 15,320
Likes: 3,927
From: Cape Coral, Florida
Thread Starter
3rd Gear
Joined: Nov 2025
Posts: 3
Likes: 0
Moderator, Tech Contributor
Joined: Sep 2013
Posts: 15,320
Likes: 3,927
From: Cape Coral, Florida
Being you are a classic car guy and this is new to you this will be impossible for you to diagnose…you need to know how to test electrical circuits and how the sensors in these cars interact with each other and how they work and how to interpret live data from a scan tool…if you know what a labscope is having one to use is critical…you will just waste time and money shotgunning parts…seek a professional diagnostician.
Last edited by C5 Diag; Nov 18, 2025 at 12:09 PM.
Tech Contributor
Joined: Jan 2007
Posts: 19,246
Likes: 1,095
From: Dyer, IN
Start simple. Pull your codes from the DIC and post them here.
Le Mans Master
Joined: Jul 2010
Posts: 5,954
Likes: 711
I tell all people who wants to buy a c5 is take an automotive electronics and mechanics class because it will save you 1000's of dollars in the long run with these cars.n I hope you have deep pockets. This is typical with new used c5's. Consent new buyers come on here with problems after they buy a c5. Best for you is get on the internet get some DVm and scan tools and start learning, Ton of testing with all the typical all issues with the c5 platform. Coming on here and asking how to teat is not the answer you have to do all the leg work. Welcome to hell if you bought a problematic c5 which its seems you started in the wrong direction. Codes ????
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Instructor
Joined: Oct 2020
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Everyone who has posted so far is correct. You really should have some type of scan tool to work on anything 1996 and newer. Scan tools were still relevant on OBD1 stuff. Data streams help the diagnostic process.
I agree with Lucky put the old stuff back on and try to diagnose the problem. Most Throttle body and MAF issues will set a code but not always. Sounds like the parts did not fix your issue anyway.
A few simple things you can do that you would do on classic cars:
Clean the throttle plate and MAF.
Check for Vacuum leaks around the intake manifold and behind the MAF. Carb/Brake cleaner whatever your chemical of choice is. Don't burn your car down.
Check the plugs and wires.
New parts do not mean the part is good. I have installed plenty of bad new parts and had to redo jobs because of it.
You said you just got the car what have you checked over? Is there a check engine light?
I agree with Lucky put the old stuff back on and try to diagnose the problem. Most Throttle body and MAF issues will set a code but not always. Sounds like the parts did not fix your issue anyway.
A few simple things you can do that you would do on classic cars:
Clean the throttle plate and MAF.
Check for Vacuum leaks around the intake manifold and behind the MAF. Carb/Brake cleaner whatever your chemical of choice is. Don't burn your car down.
Check the plugs and wires.
New parts do not mean the part is good. I have installed plenty of bad new parts and had to redo jobs because of it.
You said you just got the car what have you checked over? Is there a check engine light?
Drifting
Joined: Jan 2008
Posts: 1,722
Likes: 138
From: Florida
St. Jude Donor '09
If you are going to troubleshoot this vehicle yourself, you should have good quality digital multi-meter, a bi-directional scan tool, and the factory service manual (FSM) at a minimum. If you cannot obtain the FSM, an ALL DATA DIY account is a good option.